chemistry enthapy

1.2 H₂O₂ (l) → 2H₂O (l) + O₂ (g)

. If ΔH for the reaction = -141.4 kJ, how much energy is released when 12.0 grams of H₂O₂ is decomposed?

2. NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (g). If ΔH_rxn is –128 kJ, how much sodium hydroxide in grams is reacted to produce 25.0 kJ of heat?

3.Consider the reaction

2 Ca (s) + O₂ (g) –> 2 CaO (s) ΔH = -1270 kJ

What is the heat change for 100.0 g of Ca reacting?

4.2 H₂ (g) + C (s) –> CH₄ (g) ΔH = ?

Find ΔH for this reaction if when 10.0 g of H₂ reacts 197 kJ of heat is released.

5. 2 Na (s) + 2 H₂O (l) –> 2 NaOH (aq) + H₂ (g)

Using ΔH_f values from the table on the first page, find ΔH for this reaction using Hess’s Law equation.

6. 2 NO (g) + O₂ (g) –> 2 NO₂ (g)

Using ΔH_f values from the table on the first page, find ΔH for this reaction using Hess’s Law equation.